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Muse 1.4.3 accepts a turn/start workspaceRoots entry only as the verbatim form of the canonical path (\?\C:\..., in the disk's case and long names), so every Windows turn failed with "expected a canonical path". Send that form in turn/start, resolved with the native realpath: FileSystem.realPath is Node's JS realpath, which keeps the given case and 8.3 names. session/start and the muse serve process keep the plain path, since session/start accepts any form and muse.cmd runs under cmd.exe, which cannot start in a verbatim directory. The Muse replay kit fills <workspace> the same way, so the fixtures replay on Windows, and the recorder folds a verbatim root back into <workspace>. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This is a focused Windows-specific Muse path-handling fix with localized runtime impact and dedicated tests. Human review is warranted because the production SDK file also broadens a file-level static-analysis diagnostic suppression. You can add or adjust custom eligibility rules. Learn more. |
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📝 WalkthroughWalkthroughMuse startup resolves launcher commands on Windows. Muse turn requests use resolved workspace roots, and replay fixtures use Muse-specific workspace materialization and path normalization. ChangesMuse Windows handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🔵 Low · up to Muse may fail to start on Windows when its launcher is installed in a path containing a literal percent-delimited name. This narrow case should be fixed or explicitly accepted before merging. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 2 systems. Changed systems: Architecture concerns Review detailsSystems and components
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Keep the file-level diagnostics as they were and allow the native realpath import on its own line, as auth and cloud code do for node:crypto. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
main moved Muse Code into packages/provider-muse (pingdotgg#17331) and its replay helpers into the provider packages. This branch's Windows root follows them: museWorkspaceRoot lives in provider-muse's sdk.ts, and the provider-muse testing entry exports it for the replay testkit and the fixture recorder. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Review comments at @packages/provider-muse/src/server/sdk.ts:
- Around line 61-82: Update the fallback in museWorkspaceRoot so a failed
NodeFSP.realpath normalizes forward slashes in the original path to Windows
separators before passing it to museVerbatimPath. Preserve the successful
realpath behavior and the existing non-Windows path behavior.
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apps/server/scripts/record-muse-msp-replay-fixture.tsapps/server/src/orchestration-v2/Adapters/MuseAdapterV2.testkit.tsapps/server/src/orchestration-v2/testkit/OrchestratorReplayFixtures.integration.test.tspackages/provider-muse/src/server/adapter.test.tspackages/provider-muse/src/server/adapter.tspackages/provider-muse/src/server/sdk.test.tspackages/provider-muse/src/server/sdk.tspackages/provider-muse/src/testing.ts
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When the native realpath fails, museWorkspaceRoot fell back to the path as given. A root written with `/` became `\?\C:/repo`, but a verbatim path takes `/` literally, so the fallback now uses Windows separators. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
On Windows T3 could not start Muse at all. The Muse SDK spawns without a shell, so Node neither finds a bare `muse` with PATHEXT (ENOENT) nor runs the `muse.cmd` launcher Muse's installer puts on PATH (EINVAL). Settings showed "Muse Code SDK could not read the model catalog" and no thread could start, before any turn reached the workspace root fixed earlier here. museLaunch resolves the binary the way T3 resolves other commands and runs a `.cmd` or `.bat` under cmd.exe; createMuseSdkHostEffect starts every Muse host through it. The fixture recorder starts Muse the same way, so it no longer needs T3_MUSE_BIN on Windows. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Review comments at @packages/provider-muse/src/server/sdk.ts:
- Line 125: Update the `cmd /c` argument construction so a resolved `.cmd` path
containing both whitespace and command metacharacters is escaped safely rather
than passed unchanged by the whitespace branch. Add a Windows test that launches
a real script from a path containing both, and verify it starts successfully.
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cmd /c drops the quotes from a command that starts with one and holds `&`, `@`, `^` or a parenthesis, so a launcher under a folder such as `C:\Users\R&D Team` split at the `&` and Muse did not start. A bare `@` (echo off) now comes first, so the quoted path keeps its quotes and cmd takes every character in it literally. A path without spaces is still caret-escaped, as before. A Windows test runs a real launcher from a folder named `R&D Team (x) @ ^y` through cmd.exe, spawned as the SDK does; it fails without the `@`. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Review comments at @packages/provider-muse/src/server/sdk.ts:
- Line 130: Update command construction in museLaunch so whitespace-containing
Windows launcher paths preserve literal percent signs through cmd.exe parsing
and reach muse.cmd unchanged. Add a Windows real-launch test with a path
containing a literal %TEMP% segment to verify it.
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I independently reproduced both issues on Windows with Muse Code 1.4.4-R5419.1:
As a temporary workaround, I (my agent) configured T3 to use a small local Windows launcher. It finds the installed Muse executable and canonicalizes Using T3’s bundled Muse SDK, the original request reproduced the rejection. Through the launcher, the same request was accepted. I interrupted the test turn immediately afterward. Normal folder paths and already canonical paths also passed. Happy to test this PR on my Windows setup if that would help get it merged. |
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Problem
On Windows T3 cannot run a single Muse turn, for two reasons. Both have to be fixed before one turn runs.
muse servewithout a shell. On Windows Node then neither finds a baremusethroughPATHEXT(spawn muse ENOENT) nor runs themuse.cmdlauncher that Muse's installer puts onPATH(EINVAL: Node refuses.cmdfiles without a shell). Settings → Providers shows "Muse Code SDK could not read the model catalog", and no Muse thread can start. Pointing Binary path at the launcher'smuse-bin-<version>.exegets past this, but that file is replaced with each Muse update.turn/startworkspaceRootsentry only as the verbatim form of the canonical path (\\?\C:\…, in the case and long names the disk uses). T3 sends the plain path, so Muse refuses the turn:The second was found while testing #17151 on a Windows desktop, with Muse started from its exe. The first showed when Muse was enabled on that desktop in nightly 0.0.46-nightly.20261008.2849.
Change
museLaunch(packages/provider-muse/src/server/sdk.ts) gives the program that starts Muse. Off Windows it is the binary path, as before. On Windows it resolves the binary the way T3 resolves its other commands (PATH,PATHEXT): an.exeruns directly, and a.cmdor.batruns under cmd.exe (/d /c <launcher>;/dskips AutoRun commands, which could write into Muse's stdout). Node quotes a launcher path with spaces, and a bare@(echo off) goes before it: cmd /c drops the quotes from a command that starts with one and holds&,@,^or a parenthesis, and@first keeps them, so every character inside stays literal. A path without spaces gets cmd's metacharacters escaped.createMuseSdkHostEffect, through which every Muse host starts (provider status, model list, turns, title generation), uses it.museWorkspaceRoot(same file) gives the root thatturn/startsends. Off Windows it returns the root unchanged. On Windows it returns the nativerealpathof the checkout in verbatim form (\\?\UNC\…for a share). It has to be the native call:FileSystem.realPathis Node's JSrealpath, which keeps the case it was given and 8.3 names such asPROGRA~1, and neither is Muse's canonical form.MuseAdapterV2sends that root inturn/startonly.session/startand themuse serveprocess keep the plain path:session/startaccepts any form, and themuse.cmdlauncher runs under cmd.exe, which cannot start in a\\?\directory.<workspace>the same way, so the recorded fixtures also replay on Windows. The recorder folds the verbatim root back into<workspace>, so a recording made on Windows stays portable, and it starts Muse withmuseLaunch, so it no longer needsT3_MUSE_BINon Windows.Scope and approval
This is a small, focused fix for an obvious bug, so it comes without a prior issue: Muse, added in #17082, cannot run a single turn on Windows. The two parts above are that one problem: without the first, Muse never starts; without the second, it refuses every turn. The change is limited to how T3 starts Muse on Windows and the root its adapter sends in
turn/startthere, plus the Muse replay kit and recorder so they work there too. Other platforms start Muse and send exactly what they did before.Verification
Windows 11, Muse 1.4.3, a real Meta subscription.
Starting Muse. Node 24, spawning without a shell as the SDK does:
museENOENT…\Programs\muse\muse.cmdEINVALcmd.exe /d /c …\Programs\muse\muse.cmd serve --disable-shell --disable-write --no-session-log, through the SDK'sspawnMspConnectioninitializeanswered in 0.9 s,model/listreturned the catalog, and closing left no Muse process behindcmd.exe was also given a stand-in launcher built like Muse's own
muse.cmd(it starts PowerShell with-File "%~dp0…"and%*), spawned as the SDK spawns, in 13 folders:plain,with space,with space (x),R&D,a@b^c,paren(x),R&D Team,a@b c,a^b c,R and D&x y,100% sure,bang! dirandmixed (R&D) @ ^x. Each started with its arguments intact. Before 39fb72a, the five with spaces and&,@or^failed (cmd ran…\Rand stopped);callinstead of@breaks on^, and delayed expansion on!.On the installed nightly (2849), with Muse enabled and the default binary path, Settings show "Muse Code SDK could not read the model catalog" and the server trace has
spawn muse ENOENT.What Muse accepts. A read-only
muse serve(no shell, no writes) was probed directly, in a directory namedMuseRootProbe:session/startsession/startturn/startturn/startturn/startEnd to end. The Muse recorder runs the real orchestrator and
MuseAdapterV2against a livemuse serve, then replays the recording through the fixture's assertions before writing it:main's adapter, the turn fails to start:orchestration V2 provider turn start failed.terminal: completed, 27 s), the replay passes, and every workspace root in the recording is<workspace>.T3_MUSE_BIN, the recorder starts Muse throughmuse.cmdand cmd.exe, as T3 now does: the turn completes (45 s), the replay passes, and the recording keeps only Muse's own arguments (serve --trust-workspace --disable-sandbox).main's recorder stops at once there:spawnSync muse ENOENT.Tests, on Windows:
vp test run src/provider/museSdk.test.ts src/orchestration-v2/Adapters/MuseAdapterV2.test.ts: 38 passed. The new tests cover the verbatim form for a drive and for a share; the case fix, where a lower-cased temp directory comes back in its true case (FileSystem.realPathfails this test); the unchanged root off Windows; and an adapter that sends the verbatim root inturn/startwhile it starts Muse in the plain path.OrchestratorReplayFixtures.integration.test.tspass.main(a6d12e4), where these tests now live inprovider-muse'ssdk.test.tsandadapter.test.ts: the wholeprovider-musesuite (77) and the 5 Muse replay fixtures pass on Windows, andtsc --noEmitis clean forapps/serverandprovider-muse.museLaunch(c7857f8): the wholeprovider-musesuite (80) and the 5 Muse replay fixtures pass. The new tests cover the launch rules (an exe directly; a launcher under cmd.exe, with and without spaces in its path and with cmd's metacharacters; cmd.exe found withoutComSpec; an unresolved binary passed through; nothing resolved off Windows) and thatcreateMuseSdkHostEffectstarts Muse's launcher through cmd.exe, a test that fails without the change.@(39fb72a): the wholeprovider-musesuite (81) and the 5 Muse replay fixtures pass. A new Windows test runs a real.cmdlauncher from a folder namedR&D Team (x) @ ^ythrough cmd.exe, spawned as the SDK spawns; it fails without the@.tsc --noEmitinapps/serverandprovider-muse;vp lintandvp fmton the changed files.Known limit: cmd expands
%NAME%for a defined variable even inside the quotes, so a launcher under a folder named, say,lit %TEMP% dirdoes not start. A lone%and an undefined name are left alone (100% sure,50% off 20% moreandundef %NO_SUCH_VAR_T3% dirstart). Avoiding it needs verbatim arguments, which the SDK does not take, or delayed expansion, which strips!from the launcher's own%~dp0line instead (bang! dirthen fails).Not checked: a workspace on a network share against live Muse; macOS or Linux live, where Muse starts and the root is passed through unchanged; whether a console window shows while Muse runs under the desktop app. The SDK starts
muse servewithoutwindowsHide(meta-models/muse-code-sdk#34; SDK 1.4.4 sets it), and the desktop app's server has no console of its own. Raising the SDK would be a separate change.Created with Claude Opus 5.5 in Claude Code.
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